Transport Rule

Under the Clean Air Act, states are required to adopt State Implementation Plans that comply with the “Good Neighbor Provision” of the Clean Air Act, by including adequate provisions that prohibit in-state emission sources from emitting air pollutants in amounts that contribute significantly to nonattainment of national ambient air quality standards (NAAQS) in neighboring states. On April 29, 2014, the United States Supreme Court upheld the Environmental Protection Agency’s Cross-State Air Pollution Rule implementing the Good Neighbor Provision. This rule, also known as the Transport Rule, requires states to reduce nitrogen oxide and sulfur dioxide emissions if they are contributing significantly to exceedences of NAAQS in downwind states and allows EPA to promulgate a Federal Implementation Plan setting emissions limits for states whose SIPs have been deemed inadequate because they do not satisfy the Good Neighbor Provision. read more